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Manuscript Title: A program for the calculation of energy spectra and reduced nuclear matrix elements in the frame of Davydov-Chaban model.
Authors: J. Lubian, R. Cabezas
Program title: DAFICHA
Catalogue identifier: ACLQ_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 76(1993)98
Programming language: Fortran.
Computer: INTEL 80386+80387.
Operating system: MS-DOS 5.00.
RAM: 200K words
Word size: 16
Peripherals: disc.
Keywords: Nuclear physics, Nuclear reaction, Davydov-chaban model, Matrix elements reduced, Coupled channels, Energy spectra, Square-roots Minimization, Weber functions, Nuclear deformation.
Classification: 17.8.

Nature of problem:
Reduced matrix elements needed for coupled channel calculation in the frame of the Davydov-Chaban model are computed. Interacting potential is expanded in power of deformation paramemeters up to the second order terms, including the quadrupole and hexadecapole modes. The nuclear spectrum of Davydov-Chaban model is also computed. A search procedure of model parameters on the basis of the experimental spectra is included.

Solution method:
The Hamiltonian is diagonalized in the soft nonaxial rotator basis. The deformed Wood-Saxon potential is generated at a deformation specified in terms of the multipole expansion including nonaxial quadrupole alpha22(Y22+Y2-2) and hexadecapole alpha42(Y42+Y4-2), alpha44(Y44+Y4-4) components. The matrix elements are computed by numerical integration using the recursive procedure.

Restrictions:
Maximum number of nuclear states: 20 and maximum spin of the nuclear state: 24

Running time:
Depends on the number of nuclear states considered. In the example presented below the running time is 71 seg. (for test-1) and 280 seg. (for test-2) on PC AT (INTEL 386-387), 33 MHz.